This paper investigates how the sustainability of partial tax coordination between several governments is affected when the governments' objective function is moderate Leviathan in that policymakers are neither entirely benevolent nor fully self-interested. We show that partial tax coordination is more likely to prevail when moderate Leviathan-type governments become more revenue-maximizing Leviathans. In this case, the increased intensity of fiscal externality due to different tax rates makes partial tax coordination more sustainable at the cost of the tax union member countries' well-being.